The compensation for transient beam loading effect requires that a modulate
d RF pulsed is fed to the accelerator. A new SLED system to be able to gene
rate the modulated RF pulse in long pulse multi-bunch linac is studied. The
required waveforms of SLED input pulses are computed to generate RAMP and
flat-top RF pulses. The optimization method of SLED parameters is formulate
d. The results of cold test coincide with the theoretical prediction. RAMP
and flat-top RF pulses are generated using SLED for the first time.